From: Oleksij Rempel Date: Mon, 17 Jan 2022 08:28:52 +0000 (+0100) Subject: iio: adc: tsc2046: add sanity check to avoid to big allocations X-Git-Tag: v6.6.17~7878^2~55^2~190 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=576434fd93b91d36cb62d531888e88dac5e52540;p=platform%2Fkernel%2Flinux-rpi.git iio: adc: tsc2046: add sanity check to avoid to big allocations To avoid problematic devicetree configurations. Set allocation limit with error message and suggestion on what can be done to solve this issue. Signed-off-by: Oleksij Rempel Link: https://lore.kernel.org/r/20220117082852.3370869-2-o.rempel@pengutronix.de Signed-off-by: Jonathan Cameron --- diff --git a/drivers/iio/adc/ti-tsc2046.c b/drivers/iio/adc/ti-tsc2046.c index eb219ff..2b87f39f 100644 --- a/drivers/iio/adc/ti-tsc2046.c +++ b/drivers/iio/adc/ti-tsc2046.c @@ -679,6 +679,12 @@ static int tsc2046_adc_setup_spi_msg(struct tsc2046_adc_priv *priv) for (ch_idx = 0; ch_idx < priv->dcfg->num_channels; ch_idx++) size += tsc2046_adc_group_set_layout(priv, ch_idx, ch_idx); + if (size > PAGE_SIZE) { + dev_err(&priv->spi->dev, + "Calculated scan buffer is too big. Try to reduce spi-max-frequency, settling-time-us or oversampling-ratio\n"); + return -ENOSPC; + } + priv->tx = devm_kzalloc(&priv->spi->dev, size, GFP_KERNEL); if (!priv->tx) return -ENOMEM;